Hello altogether,
I am trying to program an ESP8266 with the Arduino IDE. By the help of
https://randomnerdtutorials.com/esp8266-nodemcu-http-get-post-arduino/ I
created a so called sketch which sends a HTTP GET request to a
WebService running on a server:
1 | #include <ESP8266WiFi.h>
|
2 | #include <ESP8266HTTPClient.h>
|
3 | #include <WiFiClient.h>
|
4 |
|
5 | const char* ssid = "MyWiFiName";
|
6 | const char* password = "MyWifiPassword";
|
7 |
|
8 | //My Domain name with URL path or IP address with path
|
9 | String serverName = "http://192.168.200.123:55558/api/DBGeraetestatus";
|
10 |
|
11 | // the following variables are unsigned longs because the time, measured in
|
12 | // milliseconds, will quickly become a bigger number than can be stored in an int.
|
13 | unsigned long lastTime = 0;
|
14 | // Timer set to 10 minutes (600000)
|
15 | unsigned long timerDelay = 600000;
|
16 | // Set timer to 5 seconds (5000)
|
17 | //unsigned long timerDelay = 5000;
|
18 |
|
19 | void setup() {
|
20 | Serial.begin(115200);
|
21 |
|
22 | WiFi.begin(ssid, password);
|
23 | Serial.println("Connecting");
|
24 | while(WiFi.status() != WL_CONNECTED) {
|
25 | delay(500);
|
26 | Serial.print(".");
|
27 | }
|
28 | Serial.println("");
|
29 | Serial.print("Connected to WiFi network with IP Address: ");
|
30 | Serial.println(WiFi.localIP());
|
31 |
|
32 | Serial.println("Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.");
|
33 | }
|
34 |
|
35 | void loop() {
|
36 | //Send an HTTP POST request every 10 minutes
|
37 | if ((millis() - lastTime) > timerDelay) {
|
38 | //Check WiFi connection status
|
39 | if(WiFi.status()== WL_CONNECTED){
|
40 | HTTPClient http;
|
41 |
|
42 | String serverPath = serverName + "?filter=ipadresse&value=192.168.200.244";
|
43 |
|
44 | // My Domain name with URL path or IP address with path
|
45 | http.begin(serverPath.c_str());
|
46 |
|
47 | // Send HTTP GET request
|
48 | int httpResponseCode = http.GET();
|
49 |
|
50 | if (httpResponseCode>0) {
|
51 | Serial.print("HTTP Response code: ");
|
52 | Serial.println(httpResponseCode);
|
53 | String payload = http.getString();
|
54 | Serial.println(payload);
|
55 | }
|
56 | else {
|
57 | Serial.print("Error code: ");
|
58 | Serial.println(httpResponseCode);
|
59 | }
|
60 | // Free resources
|
61 | http.end();
|
62 | }
|
63 | else {
|
64 | Serial.println("WiFi Disconnected");
|
65 | }
|
66 | lastTime = millis();
|
67 | }
|
68 | }
|
The answer is always a JSON which contains a 4 digit code.
The WebService on the server itself sends another HTTP GET request to a
special machine, but by attaching NetworkCredentials (username +
password) and setting on the one Hand the
ServerCertificateValidationCallback to validate a server certificate and
on the other hand the security protocol used by the ServicePoint objects
which the ServicePointManager object manages. Please see the following
C# code:
1 | private string getPinFromWebservice(string ip)
|
2 | {
|
3 | Uri.TryCreate(string.Format(Constants.generatePinPath, ip), UriKind.Absolute, out requestUri);
|
4 |
|
5 | var request = HttpWebRequest.Create(requestUri);
|
6 | request.ContentType = "application/json";
|
7 | request.Method = "GET";
|
8 |
|
9 | NetworkCredential nc = new NetworkCredential("MyNetworkCredentialName", "MyNetworkCredentialPassword");
|
10 | CredentialCache cache = new CredentialCache();
|
11 | cache.Add(requestUri, "Basic", nc);
|
12 | cache.Add(requestUri, "NTLM", nc);
|
13 | request.Credentials = cache;
|
14 |
|
15 | ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
|
16 | ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
|
17 |
|
18 | using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
|
19 | {
|
20 | using (StreamReader reader = new StreamReader(response.GetResponseStream()))
|
21 | {
|
22 | var json = reader.ReadToEnd();
|
23 | return System.Text.RegularExpressions.Regex.Replace(json, @"[^0-9]", "").ToString();
|
24 | }
|
25 | }
|
26 | }
|
I found out, that
1 | http.setAuthorization(user, password);
|
adds basic auth and HttpClient could theoretically handle https, but may
require a certificate as parameter of
(Source:
https://github.com/esp8266/Arduino/blob/5d2563eee98ae116dc3d4b6bc14225efb3c85098/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h#L153)
Is it possible to set ServerCertificateValidationCallback and the
SecurityProtocol in Arduino/C as well? So could this C#-Code somehow be
translated that it runs onto my ESP8266? The goal is to skip the server,
send the request directly via https and with attached NetworkCredentials
to this special machine and getting this 4 digit code to unlock this
special machine.
Thanks in advance for every answer and help effort.
Best regards
Watch this topic
Disable multi-page view